Single-phase earth fault diagnosis method and device

A single-phase ground fault and fault diagnosis technology, which is applied in the direction of measuring devices, electrical devices, instruments, etc., can solve the problem of not being able to obtain three modulus traveling waves, not being able to directly obtain modulus traveling waves, and being unable to realize single-phase grounding faults Diagnosis and other issues

Active Publication Date: 2011-01-12
TSINGHUA UNIV
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Problems solved by technology

However, the modulus traveling wave cannot be obtained directly in the power system, and the three-phase traveling wave obtained by the three-phase mutual inductor needs to be transformed into a modulus traveling wave through phase-mode transformation. In most small curren

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  • Single-phase earth fault diagnosis method and device
  • Single-phase earth fault diagnosis method and device

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[0023] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the present invention is not limited to the specific embodiments disclosed below limit.

[0025] figure 1 is a flowchart of the fault diagnosis method according to the present invention.

[0026] Such as figure 1 As shown, the present invention provides a fault diagnosis method for confirming whether a single-phase ground fault occurs in a small current grounding system and confirming the location of the fault point where the fault occurs, including: step 102, real-time synchronously col...

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Abstract

The invention discloses a fault diagnosis method which is used for determining whether a single-phase earth fault occurs in a low current earth system and determining the position of a fault point. The method comprises the following steps of: (102) synchronously acquiring the power frequency voltage of a busbar of the low current earth system and the current traveling wave of all outgoing lines in real time; (104) determining an outgoing line with turbulence in all the outgoing lines when the turbulence occurs in the low current earth system; (106) determining whether the single-phase earth fault occurred in the low current earth system according to the power frequency voltage; and (108) determining the outgoing line with the turbulence as a faulty outgoing line to obtain the distance between the acquisition point and the fault point on the current traveling wave of the faulty outgoing line when the single-phase earth fault occurred in the low current earth system. The invention discloses a fault diagnosis device. The single-phase earth fault of the low current earth system can be detected according to the fault diagnosis method and device.

Description

technical field [0001] The invention relates to a power system fault detection technology in the field of power system relay protection, in particular to a single-phase ground fault diagnosis method and device. Background technique [0002] The small current grounding system refers to the system with a small fault current when a single-phase grounding fault occurs, specifically refers to the neutral point not grounded, the neutral point through the arc suppression coil or the neutral point through the high resistance grounding system, commonly known as the small current system. When a single-phase ground fault occurs in a small current system, since it does not constitute a short-circuit circuit, it is not necessary to quickly cut off the faulty line and stop the user's power supply. According to statistics, single-phase ground faults account for more than 70% of all faults in the entire power distribution system. In order to ensure the reliability of power supply, my count...

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Application Information

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IPC IPC(8): G01R31/02G01B7/02
Inventor 施慎行董新洲
Owner TSINGHUA UNIV
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